diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 3.4.0
+### Removed
+* Drop `EitherT` support
+
 ## 3.3.0
 ### Changed
 * Support for ghc-8.2 (Catherine Galkina)
diff --git a/postgresql-query.cabal b/postgresql-query.cabal
--- a/postgresql-query.cabal
+++ b/postgresql-query.cabal
@@ -1,5 +1,5 @@
 name:                postgresql-query
-version:             3.3.0
+version:             3.4.0
 
 synopsis: Sql interpolating quasiquote plus some kind of primitive ORM
           using it
@@ -75,7 +75,6 @@
                , bytestring
                , containers
                , data-default
-               , either
                , exceptions
                , file-embed
                , haskell-src-meta
diff --git a/src/Database/PostgreSQL/Query/Types.hs b/src/Database/PostgreSQL/Query/Types.hs
--- a/src/Database/PostgreSQL/Query/Types.hs
+++ b/src/Database/PostgreSQL/Query/Types.hs
@@ -32,7 +32,6 @@
 import Control.Monad.Trans
 import Control.Monad.Trans.Cont
 import Control.Monad.Trans.Control
-import Control.Monad.Trans.Either
 import Control.Monad.Trans.Except
 import Control.Monad.Trans.Identity
 import Control.Monad.Trans.Maybe
@@ -217,12 +216,6 @@
 class (MonadBase IO m) => HasPostgres m where
     withPGConnection :: (Connection -> m a) -> m a
 
-instance (HasPostgres m) => HasPostgres (EitherT e m) where
-    withPGConnection action = do
-        EitherT $ withPGConnection $ \con -> do
-            runEitherT $ action con
-    {-# INLINABLE withPGConnection #-}
-
 instance (HasPostgres m) => HasPostgres (ExceptT e m) where
     withPGConnection action = do
         ExceptT $ withPGConnection $ \con -> do
@@ -288,7 +281,6 @@
 -- connection from e.g. connection pool is not.
 class TransactionSafe (m :: * -> *)
 
-instance (TransactionSafe m) => TransactionSafe (EitherT e m)
 instance (TransactionSafe m) => TransactionSafe (ExceptT e m)
 instance (TransactionSafe m) => TransactionSafe (IdentityT m)
 instance (TransactionSafe m) => TransactionSafe (MaybeT m)